Duke Ceres was a Chthonian demon in charge of the Zarosian fourth legion fighting during the Kharidian–Zarosian War. His fate is currently unknown, although he was most likely incinerated by Tumeken at the end of the war, alongside his legion.
In Latin Ceres translates to "wheat". In Roman mythology, Ceres was the goddess of grain and fertility. In astronomy, Ceres is a dwarf planet between Mars and Jupiter.